基于铽基卤化物的X射线成像研究
Research on X - ray Imaging Based on Terbium - based Halides
张振中 1王耀 2梁红伟2
作者信息
- 1. 东北师范大学物理学院长春 130117
- 2. 大连理工大学集成电路学院，大连 116620
- 折叠
摘要
无铅零维金属卤化物闪烁体因环境友好性和优异发光特性，成为替代传统铅基材料的研究热点。然而，现有材料在实现高光产额、优异热稳定性与柔性器件加工的协同优化方面仍面临挑战。本研究通过梯度降温和机械化学研磨法合成了一种新型零维钙钛矿闪烁体Cs?TbCl?（CTC）。该材料展现出亮绿色辐射发光特性，兼具60.4%的高荧光量子产率和56000 photons/MeV的优异光输出性能，检测限低至141.3 nGyair/s。热重分析表明其多晶结构在450℃氮气环境中保持稳定，显著优于传统闪烁体材料。为验证其X射线成像应用潜力，采用刮涂法和喷涂工艺分别制备了PMMA@CTC复合薄膜。在自建成像系统中，喷涂法制备的柔性闪烁屏展现出8.3 lp/mm的高空间分辨率（MTF=0.2），较传统刮涂法的3.3 lp/mm实现显著提升。实验证明所得薄膜在复杂电子元件成像中能清晰呈现结构细节，且无裂纹与伪影产生。本研究通过材料设计与工艺创新，为解决柔性闪烁体光产额与空间分辨率的协同优化问题提供了新策略，为发展环境友好型高精度X射线成像技术奠定了材料基础。Abstract
Lead-free zero-dimensional metal halide scintillators offer eco-friendly alternatives to lead-based materials with superior luminescence. However, balancing high light yield, thermal stability, and flexible processing remains challenging. Here, a novel 0D perovskite scintillator, Cs?TbCl? (CTC), was synthesized through gradient cooling and mechanochemical grinding. It exhibits green radioluminescence with a 60.4% photoluminescence quantum yield, 56,000 photons/MeV light output, and 141.3 nGy???/s detection limit. Thermogravimetric analysis confirms structural stability at 450 C under nitrogen, outperforming conventional scintillators.
To validate its X-ray imaging potential, PMMA@CTC composite films were fabricated using blade-coating and spray-coating techniques. In a custom-built imaging system, the spray-coated flexible scintillator screen demonstrated a high spatial resolution of 8.3 lp/mm (MTF=0.2), representing a remarkable improvement over the 3.3 lp/mm achieved by conventional blade-coating. Experimental results reveal crack-free films capable of resolving intricate structural details in complex electronic components without artifacts. This work establishes a material design and processing strategy to address the trade-off between light yield and spatial resolution in flexible scintillators, laying a foundation for environmentally friendly high-precision X-ray imaging technologies. 关键词
微电子学与固体物理学/X射线成像/闪烁体Key words
Microelectronics and Solid-State Electronics/X-ray Imaging/scintillator引用本文复制引用
张振中,王耀,梁红伟.基于铽基卤化物的X射线成像研究[EB/OL].(2025-04-29)[2025-12-13].http://www.paper.edu.cn/releasepaper/content/202504-232.学科分类
物理学/微电子学、集成电路/光电子技术/半导体技术
评论